The car won't start when warm

Maz33

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Hi everyone
Why is it a CLK 220 Cdi 2006 will not starts when the engine is warm above 60 especially above 80, it just clicks when key is at position two.
HELP, HELP, please.
 
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Maz33

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Thank you very much for the reply.
The CPS is possibility, but when the engine is warm, after pouring cold water over and along the egr cooler the engine starts without any problems.
 
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Maz33

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Hi everyone
Furthermore to the engine clicking instead of starting whilst engine is warm/hot. Past a few days that the weather has been hot, I can't start the car, it just clicks. Not been able to use the car at all, help help help please....
Any suggestion to this new problem?
Glory and joy of having a merc.
 

LostKiwi

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It's not the CPS. A failed CPS the engine spins over but won't fire.
 
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Maz33

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It's not the CPS. A failed CPS the engine spins over but won't fire.
Thank you for the reply, the merc dealer have reprogrammed the ECU, in this condition it was blow up fuse no. 57 (20 amp one of the starter fuse), the starter relay was changed with no effects. An indication of was is wrong will be greatly appreciated.
When a cold engine does not start in hot weather, this is unique never ever heard of it. Please help
Thank you in advance.
 

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Thank you for the reply, the merc dealer have reprogrammed the ECU, in this condition it was blow up fuse no. 57 (20 amp one of the starter fuse), the starter relay was changed with no effects. An indication of was is wrong will be greatly appreciated.
When a cold engine does not start in hot weather, this is unique never ever heard of it. Please help
Thank you in advance.
Are you saying it is now fixed by MB ? Could they not explain what occurred ?
 
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Maz33

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Hi again thanks for the replay
Far from it, the MB dealer charge me a large amount and said it is fixed, when I told them the problem is not solved yet, they asked for more money (open cheque) to investigate, it seems the task carried out by MB does not carry grantee.
The car still will not start (just clicks) when the engine is warm/hot. In the past few days that weather has been, the engine will not start even though the engine is cold, at turn of key to position 2 to start, just a click noise comes from engine compartment. A help and ideas will be greatly appreciated .
 
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LostKiwi

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If you get a click it could be:
Bad starter
Bad starter solenoid
Bad earth
Bad starter relay (if yours has one).

If the click is from lower left (passenger) side it's the first three. If the click is from the fusebox area it's the last two.
 
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Maz33

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Thanks for replying to my problem,
The starter motor has been checked no problem and a mechanic checked the earth and found no problem either. The starter relay has been replaced without having any effect. Even egr valve was replaced with new one it had no effect, so the old one cleaned and put back in. In normal condition the car starts without any problems.
How does one check the starter solenoid?
Currently the car is unusable so any further ideas will be greatly appreciated
 

umblecumbuz

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If you hear a click under the bonnet when you try with the key to start your car, then the starter solenoid is being energised. If it was duff, or if its trigger wire was faulty, there would be no click.

The cause might be the starter motor itself, or possibly - no matter what your Merc Dealer said - the starter circuit. This could be either the live feed to the starter or the earth between car body and engine. The blown 20amp fuse points this way.
 

LostKiwi

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If you hear a click under the bonnet when you try with the key to start your car, then the starter solenoid is being energised. If it was duff, or if its trigger wire was faulty, there would be no click.

The cause might be the starter motor itself, or possibly - no matter what your Merc Dealer said - the starter circuit. This could be either the live feed to the starter or the earth between car body and engine. The blown 20amp fuse points this way.
The click could be the starter relay. This is why I asked him to identify where the click is coming from.
Agreed about the fuse.
 

umblecumbuz

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The click could be the starter relay. This is why I asked him to identify where the click is coming from.
Agreed about the fuse.

Two people needed. One to turn the key, while the other puts his hand on the starter solenoid. Definite ID then.
 
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Maz33

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Thank you very much guys for your inputs.
I will keep you posted if any new development.
Meanwhile, I will be grateful for further ideas.
 

davidsl500

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Originally it would crank and start when cold but not when hot. Now it won't crank when hot or cold so the problem has got worse. I would have guessed a failing electrical connection - dry joint / break in a wire / cracked PCB which was OK cold but when hot the expansion caused the failure and now its gone too far..
 

noonboots

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Apply a 12v live to the small terminal on the starter solenoid. The solenoid should click in and the starter should turn the engine. If it doesn't the starter is u/s. If it does then there is a problem with the wiring, possibly being affected by heat.
 


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